Bravo One Oil Question-GL-4 or GL-5?
10-30-2002 | 07:45 PM
#11
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Most Mercury drive oil is NOT synthetic, the "high perf"(green) is Bel-Ray 413 with an anti-foaming additive. Oil temp is very important but certainly not the only factor in determining which oil is superior (top speed or longevity?). I have seen some "wonder lubes" that spall the propshaft bearings rapidly. But gee whiz they run cooler.
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